Parametric decay instabilities of the fast wave in the lower hybrid frequency regime

Author

Kumar, Atul ; Sharma, R.P. ; Tripathi, Y.K. ; Al-Janabi, A. Hadi

Author_Institution

Centre of Energy Studies, Indian Inst. of Technol., New Delhi, India

Volume

19

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

590

Lastpage

597

Abstract

Three possible delay instabilities of the fast wave in the lower hybrid frequency regime are presented. It has been considered that a fast wave may decay into a high-frequency, lower hybrid wave and a low-frequency wave, either the ion-Bernstein wave, ion-acoustic wave, or kinetic Alfven wave. Explicit expressions for growth rates, homogeneous thresholds, and convective thresholds have been given. Applications have been pointed out in tokamak plasma during current drive experiments and magnetospheric plasmas. For example, for PLT tokamak parameters, the convective threshold for the decay instability of the fast wave into lower hybrid and ion acoustic wave is ~180 W/cm²

Keywords

plasma instability; plasma toroidal confinement; plasma waves; PLT tokamak parameters; convective threshold; convective thresholds; current drive experiments; fast wave; growth rates; high frequency wave; homogeneous thresholds; ion-Bernstein wave; ion-acoustic wave; kinetic Alfven wave; low-frequency wave; lower hybrid frequency regime; magnetospheric plasmas; parametric decay instabilities; tokamak plasma; Acoustic waves; Drives; Kinetic theory; Magnetosphere; Plasma applications; Plasma waves; Radio frequency; Tail; Tokamaks; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.90323

Filename

90323